Stone-cutting machine



Aug'. 5, 1930. 1 A. HALL ET AL STONE CUTTING MACHINE Filed Jan4 .1928 f,

Patented Aug. 5, 1930 ,UITD STATES PTIW'V y' JOHN HALL AND WALLACE L, NEWELL, OF SEATTLE, WASHINGTON, ASSIGNORS TO rani'rnn Bernay s'roNir. saw COMPANY, or* SAN FRANcrsoo,

PGRA'IfON OF NEVADA CALIFORNIA, A COR- s'roNEcUfrrrNe MACHINE Application filed January 3, 1928. Seria1`No. 244,166.'

This invention relates to machines for cutting granite and other kinds of stone into blocks of cylindrical or annular shape by means of acylindrical sawor saws through themedium of a suitable abrasive material. The object of the invention is the improvement of mechanism of this character to render the same more eiiicient and rapid in operation.

More specific objects and advantages of the invention will appear in the following description.

The invention consists in novel means for connecting the cylindrical saws and the distributor for the abrasive material to the arbor.

construction and adaptation of parts and in The invention further consists in means associated with the saws for directing the abrasive material vand flushing water therefor most effeotually to the work.

The invention further consists in 'means for iinpelling water through the saw kerfs in a direction substantially radially of the aXis of the saws rotation.

The invention further consists in the novel the novel combinations thereof hereinafter described and particularly set forth in the appended claims.

The invention in its form now preferred by us is'illustrated in the accompanyingdrawings, in which,- f

Figure 1 is a view in side elevation of stone sawing devices embodying. the present invention shown applied, parts being broken away and parts shown in vertical transverse section. Fig. 2 is a detail vertical section showing portions of the teeth of two saws, the work and the means for directing the abrasive to the saws.

Fig. 3 is a horizontal sectional View on line i5-3 of Fig. l. Fig. 4 is a top plan view of the rotary shot distributor, and the saw-carrier shown partly broken away. Fig. 5'is a view in side elevation of the lower portion of theinner saw and a transverse vertical section of the outer saw. 1

Referring to said drawings, the numeral 10 designates a vertically arranged shaft or l() arbor which has secured to its lower end, a

wheel 11 to which arerigidly secured, as by means of angle bars 12, two; cylindrical shells 13 and 14 arranged concentrically of the ar# l bor axis. Secured to the lower edges `of the respectivev shells are teethl andf'lf, each of a tetragonal shape, preferably, in side elevation with aninclined front edge,` as 17, and in horizontal section an arcuate shape concentric with the arbor axis. Said shells and the respective teeth constitute the saws of.

the presentinvention.

Said arbor is rotated and has axial feed motion imparted thereto by suitable known mechanism (not shown) to cause the saws to coact with an abrasive material, preferably chilled steel shot, or shot as hereinafter y termed, for rcutting of annulargrooves, or lrerfs, as 18 and 19, in the worlr or a block QOof stone.

Said'shot is supplied by gravitation upon.-

the work to the cutting circlevofl the saws or` into the respective saw kerfs and includes -a Vhopper 21 (Fig. 1.) which,in the twovsaw machine shown, is provided with two discharge chutes having Vin `their delivery ends veying measured quantities of shotfrom said chutes to, conduits 25, 251 leading to circular distributing troughs 26, 261'which areinounted upon the sawfcarryingjwheel 11.

The y abovev mentioned shot dispensingv wheels operated by any known .or .suitable mechanism as,for example,' a`ratchet wheel 28 which is intermittently rotated vby means of a pawl through theV medium 'of linkage* actuated'by a cam 35 which is rotated through the mediumfoftr-ansmlssion devices, shown inV 262 and 263 `of thef',distrib,atingi shot dispensing wheels (not shown) for'controughs 26 and 2.61, asv shownjin'Fig'l, are inf clined downwardly whereby the shot depositediby the conduits .25, 251 into the respective troughs gravitate to delivery tubes 47 and- 471 (Fig. V1) having their dischargeends 1 oist a regulating valve 481 for CTI cated in close relation with the inner peripheries of the respective shells 18 and 14. 48 represents a service water pipe provided with delivering` water as desired into the space A enclosed by the inner shell 14. i

The shot from the delivery tubes 47 and 471 which may not fall into the respective kerfs 19 and 18 is directed therein by means ot' circular delectors 49 and 50 which are mounted coneentrically of the saw axis upon the top of the work 20, see Figs. 1 and 2, and are secured thereto as by means of plaster of Paris or other suitable material which is indicated by 51 The deilector 49 which is located in theV space A enclosed by the inner saw 14 is desirably of a conical shape; and the other deflector which is located in the annular space B between the saws 14 and 13 is of a conoidal segmental shape with a gap 52 (Fig. 3) therein to ailford a way for the water in its travel from the lrerr" 18 to the hert 19. The shot supplied to the respective kerts remain therein until worn or pulverized and is thereupon carried away with the stone grindings by the current of water passing through the kerfs. The water from the nozzle of pipe 48 enters the space A, thence into the hert 18 wherein it fio-ws downwardly and upwardly about the portion of the saw 14 into the space B over the top surface of the work and through passage 52 in detlector 50 to the hert 19 wherein the water travels downwardly and upwardly to escape over the margin of the work.

The delivery of the water from the liert 19 may, however, by the construction of a dam 54, be regulated to ensure water being provided to the saws'before the lrerfs are formed thereby; or, when it is desirable to maintain a. head of water in excess to that provided by the depth of the lcrfs. opening in the dam through which waste water is discharged.

Y It is, nevertheless, desirable to maintain an uninterrupted passage for the water through the kerfs to prevent its being clogged by silt, or stone grindings, and for which purpose we provide on the outer periphery of each saw, or

more particularly Vits shell, series of ridges such as 131 and 141Y (Figs. 1 and 5) which are arranged somewhat helically so as to serve as spiral pumping elements when revolved with therespective saws. l

The cutting of the stone is performed by rotating the arbor 10 to drive the saws as they are gradually fed into the work. As the cutting proceeds, the revoluble mevement of the saw teeth cooperatewit-h the shot to abrade annular kerfs 18 and 19 in the stone; the water serving to ush out thes't-ne dust.'

The shot, which is indieated'b'y 69 in Fig. 2, acts in' a' known manner' between the lower 541 represents anV surface of each saw tooth and the bottom ot the respective leri'".

The construction and operation of the invention will be understood from the foregoing description.

l/Vhat we claim, is,-

1. In a. stone-sawing machine, a pair of concentric cylindrical saws, means for supplying abrading material to the cutting teeth o1c each lof said saws, means for supplying water to said saws, and helically arranged ridges provided upon the outer peripheries oi said saws for inducing the flow ot' water from the respective saws.

2. In a stone-sawing machine, a pair ot concentric cylindrical saws, means tor supplying abrading material to the cutting teeth et' each of said saws, means for supplying water to the inner of said saws, and helically arranged ridges provided upon the outer peripheries or said saws t'or inducing the flow oit water from both oi the saws.

3. ln a stone-sawing machine having' two concentrically arranged cylindrical saws, means for supplying shot to each'of said saws separately, means to supply water to the inner saw, and shot gait ing means provided within the inner saw and the annular space between the saws, the shot guidingmeans in said annular space being provided with an opening for the passage oi water from the inner saw to the outer saw.

Signed at Seattle, lvashingtonhthis 21st day oi December, 1927. U

JGHN A. HALL. VA'LLACE L. N EW ELL. 

